Created SC3012 (markdown)

SC3012.md

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+## In POSIX sh, lexicographical \> is undefined.
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+x=1.31
+y=1.29
+! [ $x \> $y ]
+```
+
+### Correct code:
+
+The easiest fix is to switch to a shell that *does* support lexicographical \>.
+
+Please add common code examples.
+
+### Rationale:
+
+Please expand on this section.
+
+### Exceptions:
+
+Please expand on this section.
+
+### Related resources:
+
+https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html#tag_20_128